The temporary cure is to unplug the horn relay.
One clue to this is if the horn relay stops clicking, or it chatters, while you're turning the steering wheel. If it does, the most likely suspect is the clock spring is coming apart. That is a wound-up ribbon cable in a plastic housing under the steering wheel. It has multiple circuits in it for the cruise control switches and the air bag. If the clock spring is coming apart, those other systems will also malfunction.
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